A Toyota specialist and Toyota speciality Shop Owner discusses how to properly test and repair your Toyota and Lexus Mass Air Flow Sensor.
We start by talking about how a Mass Air flow works and what types there are. Then we talk about some common mass air flow sensor problems. Then we look at how to properly diagnose mass air flow sensors. Then we talk about how to repair mass air flow sensors and lastly we’ll discuss some additional tips and advice regarding mass air flow problems.
TCCN Automotive Inc.
Toyota and Lexus Specialist Repair
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0:00 Intro
0:34 How Does MAF Sensors Work?
3:26 Common Sensor Problems
6:31 How to Diagnose Them
10:11 How to Repair Them
13:10 Additional Tips and Advice
Great explanation, great class, thank you.
God bless you, bought a MAF cleaner and clean the sensor even that doesnt look dirty, I noticed after mounted back that idle is more smooth, no trepidations anymore, more response in 3’d sift.10$ well spent it !Thanks again !
Amhed, I tried your MAF test on our 2008 Highlander and it passed just fine (calc load went right up to 100 at full throttle). However, I was still getting a lean condition affecting LTFT and fuel economy. I recently followed a scan tool trace of rpm and MAF data and found that the MAF would sporadically jump between 2.3g/s and 5g/s at idle (700rpm) as well. It would have made sense to me that the MAF sensor reading should increase as rpm rises. However, the MAF seemed to increase even though the rpm stayed the same. The LTFT remains high (anywhere from +20 to +28), but if I increase the throttle just a little to raise the MAF, the LTFT instantly drops to something reasonable. It’s almost as if the computer doesn’t trust the MAF and uses a rich LTFT setting anytime the throttle is closed. Something strange is going on here and I suspect there could be something additional I can look at to help diagnose the MAF besides the calculated load at full throttle.
Theres no way you said to use brake cleaner….only use MAF sensor cleaner!
Do I need to disconnect battery connection prior removing MAF senson?